| 摘要 |
PURPOSE:To estimate a frequency centering on Doppler by applying the function of a digital filter to complex number data obtained after multiplication of azimuth spot image patterns in an azimuth direction frequency area. CONSTITUTION:RAS reception data is compressed in the range direction by range compression processing 101. The initial value of a reproduction parameter is calculated by reproduction parameter calculation processing 102 and stored in a reproduction parameter file 103. Then the range compressed reception data is converted into a frequency range in the azimuth direction by azimuth direction FET processing 104 and then undergoes the correction of the range curvature distortions by range curvature correction processing 105. In azimuth spot image pattern production processing 106, a spot image pattern is produced with reference to the file 103 and converted into a frequency range via the process 107 to undergo complex multiplication 108 with the range curvature corrected data. |
